Reliability is an important factor in the operation of a distribution network system. In determining the reliability value used several parameters as a reference that is with SAIFI (System Average Interruption Frequency Index), SAIDI (System Average Interruption Duration Index), and CAIDI (Customer Average Interruption Duration Index). Based on the calculation and analysis it is found that CAIDI reliability index index from the Parent Center is categorized less reliable because there is a CAIDI value above the limit specified according to IEEE std 1366 - 2003 which has the standard value of CAIDI of 1.47 hours / interference